net/net.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26
  27 #include "net/net.h"
  28 #include "clients.h"
  29 #include "hub.h"
  30 #include "net/slirp.h"
  31 #include "net/eth.h"
  32 #include "util.h"
  33
  34 #include "monitor/monitor.h"
  35 #include "qemu/help_option.h"
  36 #include "qapi/qapi-commands-net.h"
  37 #include "qapi/qapi-visit-net.h"
  38 #include "qapi/qmp/qdict.h"
  39 #include "qapi/qmp/qerror.h"
  40 #include "qemu/error-report.h"
  41 #include "qemu/sockets.h"
  42 #include "qemu/cutils.h"
  43 #include "qemu/config-file.h"
  44 #include "qemu/ctype.h"
  45 #include "hw/qdev.h"
  46 #include "qemu/iov.h"
  47 #include "qemu/main-loop.h"
  48 #include "qemu/option.h"
  49 #include "qapi/error.h"
  50 #include "qapi/opts-visitor.h"
  51 #include "sysemu/sysemu.h"
  52 #include "sysemu/qtest.h"
  53 #include "net/filter.h"
  54 #include "qapi/string-output-visitor.h"
  55
  56 /* Net bridge is currently not supported for W32. */
  57 #if !defined(_WIN32)
  58 # define CONFIG_NET_BRIDGE
  59 #endif
  60
  61 static VMChangeStateEntry *net_change_state_entry;
  62 static QTAILQ_HEAD(, NetClientState) net_clients;
  63
  64 /***********************************************************/
  65 /* network device redirectors */
  66
  67 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  68                     Error **errp)
  69 {
  70     gchar **substrings;
  71     struct hostent *he;
  72     const char *addr, *p, *r;
  73     int port, ret = 0;
  74
  75     substrings = g_strsplit(str, ":", 2);
  76     if (!substrings || !substrings[0] || !substrings[1]) {
  77         error_setg(errp, "host address '%s' doesn't contain ':' "
  78                    "separating host from port", str);
  79         ret = -1;
  80         goto out;
  81     }
  82
  83     addr = substrings[0];
  84     p = substrings[1];
  85
  86     saddr->sin_family = AF_INET;
  87     if (addr[0] == '\0') {
  88         saddr->sin_addr.s_addr = 0;
  89     } else {
  90         if (qemu_isdigit(addr[0])) {
  91             if (!inet_aton(addr, &saddr->sin_addr)) {
  92                 error_setg(errp, "host address '%s' is not a valid "
  93                            "IPv4 address", addr);
  94                 ret = -1;
  95                 goto out;
  96             }
  97         } else {
  98             he = gethostbyname(addr);
  99             if (he == NULL) {
 100                 error_setg(errp, "can't resolve host address '%s'", addr);
 101                 ret = -1;
 102                 goto out;
 103             }
 104             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 105         }
 106     }
 107     port = strtol(p, (char **)&r, 0);
 108     if (r == p) {
 109         error_setg(errp, "port number '%s' is invalid", p);
 110         ret = -1;
 111         goto out;
 112     }
 113     saddr->sin_port = htons(port);
 114
 115 out:
 116     g_strfreev(substrings);
 117     return ret;
 118 }
 119
 120 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 121 {
 122     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 123                            macaddr[0], macaddr[1], macaddr[2],
 124                            macaddr[3], macaddr[4], macaddr[5]);
 125 }
 126
 127 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 128 {
 129     snprintf(nc->info_str, sizeof(nc->info_str),
 130              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 131              nc->model,
 132              macaddr[0], macaddr[1], macaddr[2],
 133              macaddr[3], macaddr[4], macaddr[5]);
 134 }
 135
 136 static int mac_table[256] = {0};
 137
 138 static void qemu_macaddr_set_used(MACAddr *macaddr)
 139 {
 140     int index;
 141
 142     for (index = 0x56; index < 0xFF; index++) {
 143         if (macaddr->a[5] == index) {
 144             mac_table[index]++;
 145         }
 146     }
 147 }
 148
 149 static void qemu_macaddr_set_free(MACAddr *macaddr)
 150 {
 151     int index;
 152     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 153
 154     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 155         return;
 156     }
 157     for (index = 0x56; index < 0xFF; index++) {
 158         if (macaddr->a[5] == index) {
 159             mac_table[index]--;
 160         }
 161     }
 162 }
 163
 164 static int qemu_macaddr_get_free(void)
 165 {
 166     int index;
 167
 168     for (index = 0x56; index < 0xFF; index++) {
 169         if (mac_table[index] == 0) {
 170             return index;
 171         }
 172     }
 173
 174     return -1;
 175 }
 176
 177 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 178 {
 179     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 180     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 181
 182     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 183         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 184             return;
 185         } else {
 186             qemu_macaddr_set_used(macaddr);
 187             return;
 188         }
 189     }
 190
 191     macaddr->a[0] = 0x52;
 192     macaddr->a[1] = 0x54;
 193     macaddr->a[2] = 0x00;
 194     macaddr->a[3] = 0x12;
 195     macaddr->a[4] = 0x34;
 196     macaddr->a[5] = qemu_macaddr_get_free();
 197     qemu_macaddr_set_used(macaddr);
 198 }
 199
 200 /**
 201  * Generate a name for net client
 202  *
 203  * Only net clients created with the legacy -net option and NICs need this.
 204  */
 205 static char *assign_name(NetClientState *nc1, const char *model)
 206 {
 207     NetClientState *nc;
 208     int id = 0;
 209
 210     QTAILQ_FOREACH(nc, &net_clients, next) {
 211         if (nc == nc1) {
 212             continue;
 213         }
 214         if (strcmp(nc->model, model) == 0) {
 215             id++;
 216         }
 217     }
 218
 219     return g_strdup_printf("%s.%d", model, id);
 220 }
 221
 222 static void qemu_net_client_destructor(NetClientState *nc)
 223 {
 224     g_free(nc);
 225 }
 226 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 227                                        unsigned flags,
 228                                        const struct iovec *iov,
 229                                        int iovcnt,
 230                                        void *opaque);
 231
 232 static void qemu_net_client_setup(NetClientState *nc,
 233                                   NetClientInfo *info,
 234                                   NetClientState *peer,
 235                                   const char *model,
 236                                   const char *name,
 237                                   NetClientDestructor *destructor)
 238 {
 239     nc->info = info;
 240     nc->model = g_strdup(model);
 241     if (name) {
 242         nc->name = g_strdup(name);
 243     } else {
 244         nc->name = assign_name(nc, model);
 245     }
 246
 247     if (peer) {
 248         assert(!peer->peer);
 249         nc->peer = peer;
 250         peer->peer = nc;
 251     }
 252     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 253
 254     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 255     nc->destructor = destructor;
 256     QTAILQ_INIT(&nc->filters);
 257 }
 258
 259 NetClientState *qemu_new_net_client(NetClientInfo *info,
 260                                     NetClientState *peer,
 261                                     const char *model,
 262                                     const char *name)
 263 {
 264     NetClientState *nc;
 265
 266     assert(info->size >= sizeof(NetClientState));
 267
 268     nc = g_malloc0(info->size);
 269     qemu_net_client_setup(nc, info, peer, model, name,
 270                           qemu_net_client_destructor);
 271
 272     return nc;
 273 }
 274
 275 NICState *qemu_new_nic(NetClientInfo *info,
 276                        NICConf *conf,
 277                        const char *model,
 278                        const char *name,
 279                        void *opaque)
 280 {
 281     NetClientState **peers = conf->peers.ncs;
 282     NICState *nic;
 283     int i, queues = MAX(1, conf->peers.queues);
 284
 285     assert(info->type == NET_CLIENT_DRIVER_NIC);
 286     assert(info->size >= sizeof(NICState));
 287
 288     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 289     nic->ncs = (void *)nic + info->size;
 290     nic->conf = conf;
 291     nic->opaque = opaque;
 292
 293     for (i = 0; i < queues; i++) {
 294         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 295                               NULL);
 296         nic->ncs[i].queue_index = i;
 297     }
 298
 299     return nic;
 300 }
 301
 302 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 303 {
 304     return nic->ncs + queue_index;
 305 }
 306
 307 NetClientState *qemu_get_queue(NICState *nic)
 308 {
 309     return qemu_get_subqueue(nic, 0);
 310 }
 311
 312 NICState *qemu_get_nic(NetClientState *nc)
 313 {
 314     NetClientState *nc0 = nc - nc->queue_index;
 315
 316     return (NICState *)((void *)nc0 - nc->info->size);
 317 }
 318
 319 void *qemu_get_nic_opaque(NetClientState *nc)
 320 {
 321     NICState *nic = qemu_get_nic(nc);
 322
 323     return nic->opaque;
 324 }
 325
 326 static void qemu_cleanup_net_client(NetClientState *nc)
 327 {
 328     QTAILQ_REMOVE(&net_clients, nc, next);
 329
 330     if (nc->info->cleanup) {
 331         nc->info->cleanup(nc);
 332     }
 333 }
 334
 335 static void qemu_free_net_client(NetClientState *nc)
 336 {
 337     if (nc->incoming_queue) {
 338         qemu_del_net_queue(nc->incoming_queue);
 339     }
 340     if (nc->peer) {
 341         nc->peer->peer = NULL;
 342     }
 343     g_free(nc->name);
 344     g_free(nc->model);
 345     if (nc->destructor) {
 346         nc->destructor(nc);
 347     }
 348 }
 349
 350 void qemu_del_net_client(NetClientState *nc)
 351 {
 352     NetClientState *ncs[MAX_QUEUE_NUM];
 353     int queues, i;
 354     NetFilterState *nf, *next;
 355
 356     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 357
 358     /* If the NetClientState belongs to a multiqueue backend, we will change all
 359      * other NetClientStates also.
 360      */
 361     queues = qemu_find_net_clients_except(nc->name, ncs,
 362                                           NET_CLIENT_DRIVER_NIC,
 363                                           MAX_QUEUE_NUM);
 364     assert(queues != 0);
 365
 366     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 367         object_unparent(OBJECT(nf));
 368     }
 369
 370     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 371     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 372         NICState *nic = qemu_get_nic(nc->peer);
 373         if (nic->peer_deleted) {
 374             return;
 375         }
 376         nic->peer_deleted = true;
 377
 378         for (i = 0; i < queues; i++) {
 379             ncs[i]->peer->link_down = true;
 380         }
 381
 382         if (nc->peer->info->link_status_changed) {
 383             nc->peer->info->link_status_changed(nc->peer);
 384         }
 385
 386         for (i = 0; i < queues; i++) {
 387             qemu_cleanup_net_client(ncs[i]);
 388         }
 389
 390         return;
 391     }
 392
 393     for (i = 0; i < queues; i++) {
 394         qemu_cleanup_net_client(ncs[i]);
 395         qemu_free_net_client(ncs[i]);
 396     }
 397 }
 398
 399 void qemu_del_nic(NICState *nic)
 400 {
 401     int i, queues = MAX(nic->conf->peers.queues, 1);
 402
 403     qemu_macaddr_set_free(&nic->conf->macaddr);
 404
 405     /* If this is a peer NIC and peer has already been deleted, free it now. */
 406     if (nic->peer_deleted) {
 407         for (i = 0; i < queues; i++) {
 408             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 409         }
 410     }
 411
 412     for (i = queues - 1; i >= 0; i--) {
 413         NetClientState *nc = qemu_get_subqueue(nic, i);
 414
 415         qemu_cleanup_net_client(nc);
 416         qemu_free_net_client(nc);
 417     }
 418
 419     g_free(nic);
 420 }
 421
 422 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 423 {
 424     NetClientState *nc;
 425
 426     QTAILQ_FOREACH(nc, &net_clients, next) {
 427         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 428             if (nc->queue_index == 0) {
 429                 func(qemu_get_nic(nc), opaque);
 430             }
 431         }
 432     }
 433 }
 434
 435 bool qemu_has_ufo(NetClientState *nc)
 436 {
 437     if (!nc || !nc->info->has_ufo) {
 438         return false;
 439     }
 440
 441     return nc->info->has_ufo(nc);
 442 }
 443
 444 bool qemu_has_vnet_hdr(NetClientState *nc)
 445 {
 446     if (!nc || !nc->info->has_vnet_hdr) {
 447         return false;
 448     }
 449
 450     return nc->info->has_vnet_hdr(nc);
 451 }
 452
 453 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 454 {
 455     if (!nc || !nc->info->has_vnet_hdr_len) {
 456         return false;
 457     }
 458
 459     return nc->info->has_vnet_hdr_len(nc, len);
 460 }
 461
 462 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 463 {
 464     if (!nc || !nc->info->using_vnet_hdr) {
 465         return;
 466     }
 467
 468     nc->info->using_vnet_hdr(nc, enable);
 469 }
 470
 471 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 472                           int ecn, int ufo)
 473 {
 474     if (!nc || !nc->info->set_offload) {
 475         return;
 476     }
 477
 478     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 479 }
 480
 481 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 482 {
 483     if (!nc || !nc->info->set_vnet_hdr_len) {
 484         return;
 485     }
 486
 487     nc->vnet_hdr_len = len;
 488     nc->info->set_vnet_hdr_len(nc, len);
 489 }
 490
 491 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 492 {
 493 #ifdef HOST_WORDS_BIGENDIAN
 494     if (!nc || !nc->info->set_vnet_le) {
 495         return -ENOSYS;
 496     }
 497
 498     return nc->info->set_vnet_le(nc, is_le);
 499 #else
 500     return 0;
 501 #endif
 502 }
 503
 504 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 505 {
 506 #ifdef HOST_WORDS_BIGENDIAN
 507     return 0;
 508 #else
 509     if (!nc || !nc->info->set_vnet_be) {
 510         return -ENOSYS;
 511     }
 512
 513     return nc->info->set_vnet_be(nc, is_be);
 514 #endif
 515 }
 516
 517 int qemu_can_send_packet(NetClientState *sender)
 518 {
 519     int vm_running = runstate_is_running();
 520
 521     if (!vm_running) {
 522         return 0;
 523     }
 524
 525     if (!sender->peer) {
 526         return 1;
 527     }
 528
 529     if (sender->peer->receive_disabled) {
 530         return 0;
 531     } else if (sender->peer->info->can_receive &&
 532                !sender->peer->info->can_receive(sender->peer)) {
 533         return 0;
 534     }
 535     return 1;
 536 }
 537
 538 static ssize_t filter_receive_iov(NetClientState *nc,
 539                                   NetFilterDirection direction,
 540                                   NetClientState *sender,
 541                                   unsigned flags,
 542                                   const struct iovec *iov,
 543                                   int iovcnt,
 544                                   NetPacketSent *sent_cb)
 545 {
 546     ssize_t ret = 0;
 547     NetFilterState *nf = NULL;
 548
 549     if (direction == NET_FILTER_DIRECTION_TX) {
 550         QTAILQ_FOREACH(nf, &nc->filters, next) {
 551             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 552                                          iovcnt, sent_cb);
 553             if (ret) {
 554                 return ret;
 555             }
 556         }
 557     } else {
 558         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 559             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 560                                          iovcnt, sent_cb);
 561             if (ret) {
 562                 return ret;
 563             }
 564         }
 565     }
 566
 567     return ret;
 568 }
 569
 570 static ssize_t filter_receive(NetClientState *nc,
 571                               NetFilterDirection direction,
 572                               NetClientState *sender,
 573                               unsigned flags,
 574                               const uint8_t *data,
 575                               size_t size,
 576                               NetPacketSent *sent_cb)
 577 {
 578     struct iovec iov = {
 579         .iov_base = (void *)data,
 580         .iov_len = size
 581     };
 582
 583     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 584 }
 585
 586 void qemu_purge_queued_packets(NetClientState *nc)
 587 {
 588     if (!nc->peer) {
 589         return;
 590     }
 591
 592     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 593 }
 594
 595 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 596 {
 597     nc->receive_disabled = 0;
 598
 599     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 600         if (net_hub_flush(nc->peer)) {
 601             qemu_notify_event();
 602         }
 603     }
 604     if (qemu_net_queue_flush(nc->incoming_queue)) {
 605         /* We emptied the queue successfully, signal to the IO thread to repoll
 606          * the file descriptor (for tap, for example).
 607          */
 608         qemu_notify_event();
 609     } else if (purge) {
 610         /* Unable to empty the queue, purge remaining packets */
 611         qemu_net_queue_purge(nc->incoming_queue, nc);
 612     }
 613 }
 614
 615 void qemu_flush_queued_packets(NetClientState *nc)
 616 {
 617     qemu_flush_or_purge_queued_packets(nc, false);
 618 }
 619
 620 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 621                                                  unsigned flags,
 622                                                  const uint8_t *buf, int size,
 623                                                  NetPacketSent *sent_cb)
 624 {
 625     NetQueue *queue;
 626     int ret;
 627
 628 #ifdef DEBUG_NET
 629     printf("qemu_send_packet_async:\n");
 630     qemu_hexdump((const char *)buf, stdout, "net", size);
 631 #endif
 632
 633     if (sender->link_down || !sender->peer) {
 634         return size;
 635     }
 636
 637     /* Let filters handle the packet first */
 638     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 639                          sender, flags, buf, size, sent_cb);
 640     if (ret) {
 641         return ret;
 642     }
 643
 644     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 645                          sender, flags, buf, size, sent_cb);
 646     if (ret) {
 647         return ret;
 648     }
 649
 650     queue = sender->peer->incoming_queue;
 651
 652     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 653 }
 654
 655 ssize_t qemu_send_packet_async(NetClientState *sender,
 656                                const uint8_t *buf, int size,
 657                                NetPacketSent *sent_cb)
 658 {
 659     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 660                                              buf, size, sent_cb);
 661 }
 662
 663 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 664 {
 665     return qemu_send_packet_async(nc, buf, size, NULL);
 666 }
 667
 668 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 669 {
 670     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 671                                              buf, size, NULL);
 672 }
 673
 674 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 675                                int iovcnt, unsigned flags)
 676 {
 677     uint8_t *buf = NULL;
 678     uint8_t *buffer;
 679     size_t offset;
 680     ssize_t ret;
 681
 682     if (iovcnt == 1) {
 683         buffer = iov[0].iov_base;
 684         offset = iov[0].iov_len;
 685     } else {
 686         offset = iov_size(iov, iovcnt);
 687         if (offset > NET_BUFSIZE) {
 688             return -1;
 689         }
 690         buf = g_malloc(offset);
 691         buffer = buf;
 692         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 693     }
 694
 695     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 696         ret = nc->info->receive_raw(nc, buffer, offset);
 697     } else {
 698         ret = nc->info->receive(nc, buffer, offset);
 699     }
 700
 701     g_free(buf);
 702     return ret;
 703 }
 704
 705 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 706                                        unsigned flags,
 707                                        const struct iovec *iov,
 708                                        int iovcnt,
 709                                        void *opaque)
 710 {
 711     NetClientState *nc = opaque;
 712     int ret;
 713
 714
 715     if (nc->link_down) {
 716         return iov_size(iov, iovcnt);
 717     }
 718
 719     if (nc->receive_disabled) {
 720         return 0;
 721     }
 722
 723     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 724         ret = nc->info->receive_iov(nc, iov, iovcnt);
 725     } else {
 726         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 727     }
 728
 729     if (ret == 0) {
 730         nc->receive_disabled = 1;
 731     }
 732
 733     return ret;
 734 }
 735
 736 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 737                                 const struct iovec *iov, int iovcnt,
 738                                 NetPacketSent *sent_cb)
 739 {
 740     NetQueue *queue;
 741     size_t size = iov_size(iov, iovcnt);
 742     int ret;
 743
 744     if (size > NET_BUFSIZE) {
 745         return size;
 746     }
 747
 748     if (sender->link_down || !sender->peer) {
 749         return size;
 750     }
 751
 752     /* Let filters handle the packet first */
 753     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 754                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 755     if (ret) {
 756         return ret;
 757     }
 758
 759     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 760                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 761     if (ret) {
 762         return ret;
 763     }
 764
 765     queue = sender->peer->incoming_queue;
 766
 767     return qemu_net_queue_send_iov(queue, sender,
 768                                    QEMU_NET_PACKET_FLAG_NONE,
 769                                    iov, iovcnt, sent_cb);
 770 }
 771
 772 ssize_t
 773 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 774 {
 775     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 776 }
 777
 778 NetClientState *qemu_find_netdev(const char *id)
 779 {
 780     NetClientState *nc;
 781
 782     QTAILQ_FOREACH(nc, &net_clients, next) {
 783         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 784             continue;
 785         if (!strcmp(nc->name, id)) {
 786             return nc;
 787         }
 788     }
 789
 790     return NULL;
 791 }
 792
 793 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 794                                  NetClientDriver type, int max)
 795 {
 796     NetClientState *nc;
 797     int ret = 0;
 798
 799     QTAILQ_FOREACH(nc, &net_clients, next) {
 800         if (nc->info->type == type) {
 801             continue;
 802         }
 803         if (!id || !strcmp(nc->name, id)) {
 804             if (ret < max) {
 805                 ncs[ret] = nc;
 806             }
 807             ret++;
 808         }
 809     }
 810
 811     return ret;
 812 }
 813
 814 static int nic_get_free_idx(void)
 815 {
 816     int index;
 817
 818     for (index = 0; index < MAX_NICS; index++)
 819         if (!nd_table[index].used)
 820             return index;
 821     return -1;
 822 }
 823
 824 int qemu_show_nic_models(const char *arg, const char *const *models)
 825 {
 826     int i;
 827
 828     if (!arg || !is_help_option(arg)) {
 829         return 0;
 830     }
 831
 832     printf("Supported NIC models:\n");
 833     for (i = 0 ; models[i]; i++) {
 834         printf("%s\n", models[i]);
 835     }
 836     return 1;
 837 }
 838
 839 void qemu_check_nic_model(NICInfo *nd, const char *model)
 840 {
 841     const char *models[2];
 842
 843     models[0] = model;
 844     models[1] = NULL;
 845
 846     if (qemu_show_nic_models(nd->model, models))
 847         exit(0);
 848     if (qemu_find_nic_model(nd, models, model) < 0)
 849         exit(1);
 850 }
 851
 852 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 853                         const char *default_model)
 854 {
 855     int i;
 856
 857     if (!nd->model)
 858         nd->model = g_strdup(default_model);
 859
 860     for (i = 0 ; models[i]; i++) {
 861         if (strcmp(nd->model, models[i]) == 0)
 862             return i;
 863     }
 864
 865     error_report("Unsupported NIC model: %s", nd->model);
 866     return -1;
 867 }
 868
 869 static int net_init_nic(const Netdev *netdev, const char *name,
 870                         NetClientState *peer, Error **errp)
 871 {
 872     int idx;
 873     NICInfo *nd;
 874     const NetLegacyNicOptions *nic;
 875
 876     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 877     nic = &netdev->u.nic;
 878
 879     idx = nic_get_free_idx();
 880     if (idx == -1 || nb_nics >= MAX_NICS) {
 881         error_setg(errp, "too many NICs");
 882         return -1;
 883     }
 884
 885     nd = &nd_table[idx];
 886
 887     memset(nd, 0, sizeof(*nd));
 888
 889     if (nic->has_netdev) {
 890         nd->netdev = qemu_find_netdev(nic->netdev);
 891         if (!nd->netdev) {
 892             error_setg(errp, "netdev '%s' not found", nic->netdev);
 893             return -1;
 894         }
 895     } else {
 896         assert(peer);
 897         nd->netdev = peer;
 898     }
 899     nd->name = g_strdup(name);
 900     if (nic->has_model) {
 901         nd->model = g_strdup(nic->model);
 902     }
 903     if (nic->has_addr) {
 904         nd->devaddr = g_strdup(nic->addr);
 905     }
 906
 907     if (nic->has_macaddr &&
 908         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 909         error_setg(errp, "invalid syntax for ethernet address");
 910         return -1;
 911     }
 912     if (nic->has_macaddr &&
 913         is_multicast_ether_addr(nd->macaddr.a)) {
 914         error_setg(errp,
 915                    "NIC cannot have multicast MAC address (odd 1st byte)");
 916         return -1;
 917     }
 918     qemu_macaddr_default_if_unset(&nd->macaddr);
 919
 920     if (nic->has_vectors) {
 921         if (nic->vectors > 0x7ffffff) {
 922             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 923             return -1;
 924         }
 925         nd->nvectors = nic->vectors;
 926     } else {
 927         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 928     }
 929
 930     nd->used = 1;
 931     nb_nics++;
 932
 933     return idx;
 934 }
 935
 936
 937 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 938     const Netdev *netdev,
 939     const char *name,
 940     NetClientState *peer, Error **errp) = {
 941         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 942 #ifdef CONFIG_SLIRP
 943         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 944 #endif
 945         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 946         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 947 #ifdef CONFIG_VDE
 948         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 949 #endif
 950 #ifdef CONFIG_NETMAP
 951         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 952 #endif
 953 #ifdef CONFIG_NET_BRIDGE
 954         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 955 #endif
 956         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 957 #ifdef CONFIG_VHOST_NET_USER
 958         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 959 #endif
 960 #ifdef CONFIG_L2TPV3
 961         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 962 #endif
 963 };
 964
 965
 966 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 967 {
 968     Netdev legacy = {0};
 969     const Netdev *netdev;
 970     const char *name;
 971     NetClientState *peer = NULL;
 972
 973     if (is_netdev) {
 974         netdev = object;
 975         name = netdev->id;
 976
 977         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 978             !net_client_init_fun[netdev->type]) {
 979             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 980                        "a netdev backend type");
 981             return -1;
 982         }
 983     } else {
 984         const NetLegacy *net = object;
 985         const NetLegacyOptions *opts = net->opts;
 986         legacy.id = net->id;
 987         netdev = &legacy;
 988         /* missing optional values have been initialized to "all bits zero" */
 989         name = net->has_id ? net->id : net->name;
 990
 991         if (net->has_name) {
 992             warn_report("The 'name' parameter is deprecated, use 'id' instead");
 993         }
 994
 995         /* Map the old options to the new flat type */
 996         switch (opts->type) {
 997         case NET_LEGACY_OPTIONS_TYPE_NONE:
 998             return 0; /* nothing to do */
 999         case NET_LEGACY_OPTIONS_TYPE_NIC:
1000             legacy.type = NET_CLIENT_DRIVER_NIC;
1001             legacy.u.nic = opts->u.nic;
1002             break;
1003         case NET_LEGACY_OPTIONS_TYPE_USER:
1004             legacy.type = NET_CLIENT_DRIVER_USER;
1005             legacy.u.user = opts->u.user;
1006             break;
1007         case NET_LEGACY_OPTIONS_TYPE_TAP:
1008             legacy.type = NET_CLIENT_DRIVER_TAP;
1009             legacy.u.tap = opts->u.tap;
1010             break;
1011         case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1012             legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1013             legacy.u.l2tpv3 = opts->u.l2tpv3;
1014             break;
1015         case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1016             legacy.type = NET_CLIENT_DRIVER_SOCKET;
1017             legacy.u.socket = opts->u.socket;
1018             break;
1019         case NET_LEGACY_OPTIONS_TYPE_VDE:
1020             legacy.type = NET_CLIENT_DRIVER_VDE;
1021             legacy.u.vde = opts->u.vde;
1022             break;
1023         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1024             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1025             legacy.u.bridge = opts->u.bridge;
1026             break;
1027         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1028             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1029             legacy.u.netmap = opts->u.netmap;
1030             break;
1031         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1032             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1033             legacy.u.vhost_user = opts->u.vhost_user;
1034             break;
1035         default:
1036             abort();
1037         }
1038
1039         if (!net_client_init_fun[netdev->type]) {
1040             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1041                        "a net backend type (maybe it is not compiled "
1042                        "into this binary)");
1043             return -1;
1044         }
1045
1046         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1047         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1048             !opts->u.nic.has_netdev) {
1049             peer = net_hub_add_port(0, NULL, NULL);
1050         }
1051     }
1052
1053     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1054         /* FIXME drop when all init functions store an Error */
1055         if (errp && !*errp) {
1056             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1057                        NetClientDriver_str(netdev->type));
1058         }
1059         return -1;
1060     }
1061     return 0;
1062 }
1063
1064 static void show_netdevs(void)
1065 {
1066     int idx;
1067     const char *available_netdevs[] = {
1068         "socket",
1069         "hubport",
1070         "tap",
1071 #ifdef CONFIG_SLIRP
1072         "user",
1073 #endif
1074 #ifdef CONFIG_L2TPV3
1075         "l2tpv3",
1076 #endif
1077 #ifdef CONFIG_VDE
1078         "vde",
1079 #endif
1080 #ifdef CONFIG_NET_BRIDGE
1081         "bridge",
1082 #endif
1083 #ifdef CONFIG_NETMAP
1084         "netmap",
1085 #endif
1086 #ifdef CONFIG_POSIX
1087         "vhost-user",
1088 #endif
1089     };
1090
1091     printf("Available netdev backend types:\n");
1092     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1093         puts(available_netdevs[idx]);
1094     }
1095 }
1096
1097 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1098 {
1099     gchar **substrings = NULL;
1100     void *object = NULL;
1101     Error *err = NULL;
1102     int ret = -1;
1103     Visitor *v = opts_visitor_new(opts);
1104
1105     const char *type = qemu_opt_get(opts, "type");
1106
1107     if (is_netdev && type && is_help_option(type)) {
1108         show_netdevs();
1109         exit(0);
1110     } else {
1111         /* Parse convenience option format ip6-net=fec0::0[/64] */
1112         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1113
1114         if (ip6_net) {
1115             char *prefix_addr;
1116             unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1117
1118             substrings = g_strsplit(ip6_net, "/", 2);
1119             if (!substrings || !substrings[0]) {
1120                 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1121                            "a valid IPv6 prefix");
1122                 goto out;
1123             }
1124
1125             prefix_addr = substrings[0];
1126
1127             if (substrings[1]) {
1128                 /* User-specified prefix length.  */
1129                 int err;
1130
1131                 err = qemu_strtoul(substrings[1], NULL, 10, &prefix_len);
1132                 if (err) {
1133                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1134                                "ipv6-prefixlen", "a number");
1135                     goto out;
1136                 }
1137             }
1138
1139             qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1140             qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1141                                 &error_abort);
1142             qemu_opt_unset(opts, "ipv6-net");
1143         }
1144     }
1145
1146     if (is_netdev) {
1147         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1148     } else {
1149         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1150     }
1151
1152     if (!err) {
1153         ret = net_client_init1(object, is_netdev, &err);
1154     }
1155
1156     if (is_netdev) {
1157         qapi_free_Netdev(object);
1158     } else {
1159         qapi_free_NetLegacy(object);
1160     }
1161
1162 out:
1163     error_propagate(errp, err);
1164     g_strfreev(substrings);
1165     visit_free(v);
1166     return ret;
1167 }
1168
1169 void netdev_add(QemuOpts *opts, Error **errp)
1170 {
1171     net_client_init(opts, true, errp);
1172 }
1173
1174 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1175 {
1176     Error *local_err = NULL;
1177     QemuOptsList *opts_list;
1178     QemuOpts *opts;
1179
1180     opts_list = qemu_find_opts_err("netdev", &local_err);
1181     if (local_err) {
1182         goto out;
1183     }
1184
1185     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1186     if (local_err) {
1187         goto out;
1188     }
1189
1190     netdev_add(opts, &local_err);
1191     if (local_err) {
1192         qemu_opts_del(opts);
1193         goto out;
1194     }
1195
1196 out:
1197     error_propagate(errp, local_err);
1198 }
1199
1200 void qmp_netdev_del(const char *id, Error **errp)
1201 {
1202     NetClientState *nc;
1203     QemuOpts *opts;
1204
1205     nc = qemu_find_netdev(id);
1206     if (!nc) {
1207         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1208                   "Device '%s' not found", id);
1209         return;
1210     }
1211
1212     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1213     if (!opts) {
1214         error_setg(errp, "Device '%s' is not a netdev", id);
1215         return;
1216     }
1217
1218     qemu_del_net_client(nc);
1219     qemu_opts_del(opts);
1220 }
1221
1222 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1223 {
1224     char *str;
1225     ObjectProperty *prop;
1226     ObjectPropertyIterator iter;
1227     Visitor *v;
1228
1229     /* generate info str */
1230     object_property_iter_init(&iter, OBJECT(nf));
1231     while ((prop = object_property_iter_next(&iter))) {
1232         if (!strcmp(prop->name, "type")) {
1233             continue;
1234         }
1235         v = string_output_visitor_new(false, &str);
1236         object_property_get(OBJECT(nf), v, prop->name, NULL);
1237         visit_complete(v, &str);
1238         visit_free(v);
1239         monitor_printf(mon, ",%s=%s", prop->name, str);
1240         g_free(str);
1241     }
1242     monitor_printf(mon, "\n");
1243 }
1244
1245 void print_net_client(Monitor *mon, NetClientState *nc)
1246 {
1247     NetFilterState *nf;
1248
1249     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1250                    nc->queue_index,
1251                    NetClientDriver_str(nc->info->type),
1252                    nc->info_str);
1253     if (!QTAILQ_EMPTY(&nc->filters)) {
1254         monitor_printf(mon, "filters:\n");
1255     }
1256     QTAILQ_FOREACH(nf, &nc->filters, next) {
1257         char *path = object_get_canonical_path_component(OBJECT(nf));
1258
1259         monitor_printf(mon, "  - %s: type=%s", path,
1260                        object_get_typename(OBJECT(nf)));
1261         netfilter_print_info(mon, nf);
1262         g_free(path);
1263     }
1264 }
1265
1266 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1267                                       Error **errp)
1268 {
1269     NetClientState *nc;
1270     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1271
1272     QTAILQ_FOREACH(nc, &net_clients, next) {
1273         RxFilterInfoList *entry;
1274         RxFilterInfo *info;
1275
1276         if (has_name && strcmp(nc->name, name) != 0) {
1277             continue;
1278         }
1279
1280         /* only query rx-filter information of NIC */
1281         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1282             if (has_name) {
1283                 error_setg(errp, "net client(%s) isn't a NIC", name);
1284                 return NULL;
1285             }
1286             continue;
1287         }
1288
1289         /* only query information on queue 0 since the info is per nic,
1290          * not per queue
1291          */
1292         if (nc->queue_index != 0)
1293             continue;
1294
1295         if (nc->info->query_rx_filter) {
1296             info = nc->info->query_rx_filter(nc);
1297             entry = g_malloc0(sizeof(*entry));
1298             entry->value = info;
1299
1300             if (!filter_list) {
1301                 filter_list = entry;
1302             } else {
1303                 last_entry->next = entry;
1304             }
1305             last_entry = entry;
1306         } else if (has_name) {
1307             error_setg(errp, "net client(%s) doesn't support"
1308                        " rx-filter querying", name);
1309             return NULL;
1310         }
1311
1312         if (has_name) {
1313             break;
1314         }
1315     }
1316
1317     if (filter_list == NULL && has_name) {
1318         error_setg(errp, "invalid net client name: %s", name);
1319     }
1320
1321     return filter_list;
1322 }
1323
1324 void hmp_info_network(Monitor *mon, const QDict *qdict)
1325 {
1326     NetClientState *nc, *peer;
1327     NetClientDriver type;
1328
1329     net_hub_info(mon);
1330
1331     QTAILQ_FOREACH(nc, &net_clients, next) {
1332         peer = nc->peer;
1333         type = nc->info->type;
1334
1335         /* Skip if already printed in hub info */
1336         if (net_hub_id_for_client(nc, NULL) == 0) {
1337             continue;
1338         }
1339
1340         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1341             print_net_client(mon, nc);
1342         } /* else it's a netdev connected to a NIC, printed with the NIC */
1343         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1344             monitor_printf(mon, " \\ ");
1345             print_net_client(mon, peer);
1346         }
1347     }
1348 }
1349
1350 void colo_notify_filters_event(int event, Error **errp)
1351 {
1352     NetClientState *nc;
1353     NetFilterState *nf;
1354     NetFilterClass *nfc = NULL;
1355     Error *local_err = NULL;
1356
1357     QTAILQ_FOREACH(nc, &net_clients, next) {
1358         QTAILQ_FOREACH(nf, &nc->filters, next) {
1359             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1360             nfc->handle_event(nf, event, &local_err);
1361             if (local_err) {
1362                 error_propagate(errp, local_err);
1363                 return;
1364             }
1365         }
1366     }
1367 }
1368
1369 void qmp_set_link(const char *name, bool up, Error **errp)
1370 {
1371     NetClientState *ncs[MAX_QUEUE_NUM];
1372     NetClientState *nc;
1373     int queues, i;
1374
1375     queues = qemu_find_net_clients_except(name, ncs,
1376                                           NET_CLIENT_DRIVER__MAX,
1377                                           MAX_QUEUE_NUM);
1378
1379     if (queues == 0) {
1380         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1381                   "Device '%s' not found", name);
1382         return;
1383     }
1384     nc = ncs[0];
1385
1386     for (i = 0; i < queues; i++) {
1387         ncs[i]->link_down = !up;
1388     }
1389
1390     if (nc->info->link_status_changed) {
1391         nc->info->link_status_changed(nc);
1392     }
1393
1394     if (nc->peer) {
1395         /* Change peer link only if the peer is NIC and then notify peer.
1396          * If the peer is a HUBPORT or a backend, we do not change the
1397          * link status.
1398          *
1399          * This behavior is compatible with qemu hubs where there could be
1400          * multiple clients that can still communicate with each other in
1401          * disconnected mode. For now maintain this compatibility.
1402          */
1403         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1404             for (i = 0; i < queues; i++) {
1405                 ncs[i]->peer->link_down = !up;
1406             }
1407         }
1408         if (nc->peer->info->link_status_changed) {
1409             nc->peer->info->link_status_changed(nc->peer);
1410         }
1411     }
1412 }
1413
1414 static void net_vm_change_state_handler(void *opaque, int running,
1415                                         RunState state)
1416 {
1417     NetClientState *nc;
1418     NetClientState *tmp;
1419
1420     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1421         if (running) {
1422             /* Flush queued packets and wake up backends. */
1423             if (nc->peer && qemu_can_send_packet(nc)) {
1424                 qemu_flush_queued_packets(nc->peer);
1425             }
1426         } else {
1427             /* Complete all queued packets, to guarantee we don't modify
1428              * state later when VM is not running.
1429              */
1430             qemu_flush_or_purge_queued_packets(nc, true);
1431         }
1432     }
1433 }
1434
1435 void net_cleanup(void)
1436 {
1437     NetClientState *nc;
1438
1439     /* We may del multiple entries during qemu_del_net_client(),
1440      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1441      */
1442     while (!QTAILQ_EMPTY(&net_clients)) {
1443         nc = QTAILQ_FIRST(&net_clients);
1444         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1445             qemu_del_nic(qemu_get_nic(nc));
1446         } else {
1447             qemu_del_net_client(nc);
1448         }
1449     }
1450
1451     qemu_del_vm_change_state_handler(net_change_state_entry);
1452 }
1453
1454 void net_check_clients(void)
1455 {
1456     NetClientState *nc;
1457     int i;
1458
1459     net_hub_check_clients();
1460
1461     QTAILQ_FOREACH(nc, &net_clients, next) {
1462         if (!nc->peer) {
1463             warn_report("%s %s has no peer",
1464                         nc->info->type == NET_CLIENT_DRIVER_NIC
1465                         ? "nic" : "netdev",
1466                         nc->name);
1467         }
1468     }
1469
1470     /* Check that all NICs requested via -net nic actually got created.
1471      * NICs created via -device don't need to be checked here because
1472      * they are always instantiated.
1473      */
1474     for (i = 0; i < MAX_NICS; i++) {
1475         NICInfo *nd = &nd_table[i];
1476         if (nd->used && !nd->instantiated) {
1477             warn_report("requested NIC (%s, model %s) "
1478                         "was not created (not supported by this machine?)",
1479                         nd->name ? nd->name : "anonymous",
1480                         nd->model ? nd->model : "unspecified");
1481         }
1482     }
1483 }
1484
1485 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1486 {
1487     return net_client_init(opts, false, errp);
1488 }
1489
1490 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1491 {
1492     return net_client_init(opts, true, errp);
1493 }
1494
1495 /* For the convenience "--nic" parameter */
1496 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1497 {
1498     char *mac, *nd_id;
1499     int idx, ret;
1500     NICInfo *ni;
1501     const char *type;
1502
1503     type = qemu_opt_get(opts, "type");
1504     if (type && g_str_equal(type, "none")) {
1505         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1506     }
1507
1508     idx = nic_get_free_idx();
1509     if (idx == -1 || nb_nics >= MAX_NICS) {
1510         error_setg(errp, "no more on-board/default NIC slots available");
1511         return -1;
1512     }
1513
1514     if (!type) {
1515         qemu_opt_set(opts, "type", "user", &error_abort);
1516     }
1517
1518     ni = &nd_table[idx];
1519     memset(ni, 0, sizeof(*ni));
1520     ni->model = qemu_opt_get_del(opts, "model");
1521
1522     /* Create an ID if the user did not specify one */
1523     nd_id = g_strdup(qemu_opts_id(opts));
1524     if (!nd_id) {
1525         nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1526         qemu_opts_set_id(opts, nd_id);
1527     }
1528
1529     /* Handle MAC address */
1530     mac = qemu_opt_get_del(opts, "mac");
1531     if (mac) {
1532         ret = net_parse_macaddr(ni->macaddr.a, mac);
1533         g_free(mac);
1534         if (ret) {
1535             error_setg(errp, "invalid syntax for ethernet address");
1536             goto out;
1537         }
1538         if (is_multicast_ether_addr(ni->macaddr.a)) {
1539             error_setg(errp, "NIC cannot have multicast MAC address");
1540             ret = -1;
1541             goto out;
1542         }
1543     }
1544     qemu_macaddr_default_if_unset(&ni->macaddr);
1545
1546     ret = net_client_init(opts, true, errp);
1547     if (ret == 0) {
1548         ni->netdev = qemu_find_netdev(nd_id);
1549         ni->used = true;
1550         nb_nics++;
1551     }
1552
1553 out:
1554     g_free(nd_id);
1555     return ret;
1556 }
1557
1558 int net_init_clients(Error **errp)
1559 {
1560     net_change_state_entry =
1561         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1562
1563     QTAILQ_INIT(&net_clients);
1564
1565     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1566                           net_init_netdev, NULL, errp)) {
1567         return -1;
1568     }
1569
1570     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1571         return -1;
1572     }
1573
1574     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1575         return -1;
1576     }
1577
1578     return 0;
1579 }
1580
1581 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1582 {
1583     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1584         return -1;
1585     }
1586
1587     return 0;
1588 }
1589
1590 /* From FreeBSD */
1591 /* XXX: optimize */
1592 uint32_t net_crc32(const uint8_t *p, int len)
1593 {
1594     uint32_t crc;
1595     int carry, i, j;
1596     uint8_t b;
1597
1598     crc = 0xffffffff;
1599     for (i = 0; i < len; i++) {
1600         b = *p++;
1601         for (j = 0; j < 8; j++) {
1602             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1603             crc <<= 1;
1604             b >>= 1;
1605             if (carry) {
1606                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1607             }
1608         }
1609     }
1610
1611     return crc;
1612 }
1613
1614 uint32_t net_crc32_le(const uint8_t *p, int len)
1615 {
1616     uint32_t crc;
1617     int carry, i, j;
1618     uint8_t b;
1619
1620     crc = 0xffffffff;
1621     for (i = 0; i < len; i++) {
1622         b = *p++;
1623         for (j = 0; j < 8; j++) {
1624             carry = (crc & 0x1) ^ (b & 0x01);
1625             crc >>= 1;
1626             b >>= 1;
1627             if (carry) {
1628                 crc ^= POLYNOMIAL_LE;
1629             }
1630         }
1631     }
1632
1633     return crc;
1634 }
1635
1636 QemuOptsList qemu_netdev_opts = {
1637     .name = "netdev",
1638     .implied_opt_name = "type",
1639     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1640     .desc = {
1641         /*
1642          * no elements => accept any params
1643          * validation will happen later
1644          */
1645         { /* end of list */ }
1646     },
1647 };
1648
1649 QemuOptsList qemu_nic_opts = {
1650     .name = "nic",
1651     .implied_opt_name = "type",
1652     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1653     .desc = {
1654         /*
1655          * no elements => accept any params
1656          * validation will happen later
1657          */
1658         { /* end of list */ }
1659     },
1660 };
1661
1662 QemuOptsList qemu_net_opts = {
1663     .name = "net",
1664     .implied_opt_name = "type",
1665     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1666     .desc = {
1667         /*
1668          * no elements => accept any params
1669          * validation will happen later
1670          */
1671         { /* end of list */ }
1672     },
1673 };
1674
1675 void net_socket_rs_init(SocketReadState *rs,
1676                         SocketReadStateFinalize *finalize,
1677                         bool vnet_hdr)
1678 {
1679     rs->state = 0;
1680     rs->vnet_hdr = vnet_hdr;
1681     rs->index = 0;
1682     rs->packet_len = 0;
1683     rs->vnet_hdr_len = 0;
1684     memset(rs->buf, 0, sizeof(rs->buf));
1685     rs->finalize = finalize;
1686 }
1687
1688 /*
1689  * Returns
1690  * 0: success
1691  * -1: error occurs
1692  */
1693 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1694 {
1695     unsigned int l;
1696
1697     while (size > 0) {
1698         /* Reassemble a packet from the network.
1699          * 0 = getting length.
1700          * 1 = getting vnet header length.
1701          * 2 = getting data.
1702          */
1703         switch (rs->state) {
1704         case 0:
1705             l = 4 - rs->index;
1706             if (l > size) {
1707                 l = size;
1708             }
1709             memcpy(rs->buf + rs->index, buf, l);
1710             buf += l;
1711             size -= l;
1712             rs->index += l;
1713             if (rs->index == 4) {
1714                 /* got length */
1715                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1716                 rs->index = 0;
1717                 if (rs->vnet_hdr) {
1718                     rs->state = 1;
1719                 } else {
1720                     rs->state = 2;
1721                     rs->vnet_hdr_len = 0;
1722                 }
1723             }
1724             break;
1725         case 1:
1726             l = 4 - rs->index;
1727             if (l > size) {
1728                 l = size;
1729             }
1730             memcpy(rs->buf + rs->index, buf, l);
1731             buf += l;
1732             size -= l;
1733             rs->index += l;
1734             if (rs->index == 4) {
1735                 /* got vnet header length */
1736                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1737                 rs->index = 0;
1738                 rs->state = 2;
1739             }
1740             break;
1741         case 2:
1742             l = rs->packet_len - rs->index;
1743             if (l > size) {
1744                 l = size;
1745             }
1746             if (rs->index + l <= sizeof(rs->buf)) {
1747                 memcpy(rs->buf + rs->index, buf, l);
1748             } else {
1749                 fprintf(stderr, "serious error: oversized packet received,"
1750                     "connection terminated.\n");
1751                 rs->index = rs->state = 0;
1752                 return -1;
1753             }
1754
1755             rs->index += l;
1756             buf += l;
1757             size -= l;
1758             if (rs->index >= rs->packet_len) {
1759                 rs->index = 0;
1760                 rs->state = 0;
1761                 assert(rs->finalize);
1762                 rs->finalize(rs);
1763             }
1764             break;
1765         }
1766     }
1767
1768     assert(size == 0);
1769     return 0;
1770 }